5. Registration and return conditions
5.1 Recording
To produce a hologram, the light source must have a certain coherence, enabling the reference wave and the object wave (coming from this light source) to interfere under the right conditions. This coherence has two aspects.
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Spatial aspect
The light source must be a point source. This is called spatial coherence. Let's look at a simplified hologram recording diagram. This is the diagram of an interferometer...
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Registration and return conditions
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